Question

我从我的片段开始标准的Android相机应用程序。一切正常，图像按照我的意愿保存。用户拍完照片后（仅此时）我想启动一个DialogFragment。

我尝试使用意图并从同一个片段调用onActivityResult()。但是MyCamera camera = new MyCamera(getActivity()); camera.start();永远不会被调用。

我如何在片段中启动相机：

takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));
activity.startActivityForResult(takePictureIntent, Constants.TAKE_PHOTO);

我的MyCamera课我是这样开始的意图：

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == Constants.TAKE_PHOTO && resultCode == Activity.RESULT_OK) {
        // do something
    }
}

回到我调用onActivityResult（）的片段中：

public class MyCamera {
    private Activity activity;
    private static final String TAG = "MyCamera";
    private String currentPhotoPath;
    private String currentFileName;
    private File currentFile;
    private Uri contentUri;

    public MyCamera(Activity activity) {
        this.activity = activity;
    }

    public void start() {
        dispatchPictureIntent();
        addPictureToGallery();
        currentPhotoPath = null;
    }

    private void dispatchPictureIntent() {
        Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        // check if device has camera
        if (takePictureIntent.resolveActivity(activity.getPackageManager()) != null) {
            File photoFile = null;
            try {
                photoFile = createImageFile();
                currentPhotoPath = photoFile.getAbsolutePath();

            } catch (IOException e) {
                e.printStackTrace();
                Toast.makeText(activity, R.string.msg_picture_not_saved, Toast.LENGTH_LONG).show();
            }
            if (photoFile != null) {
                takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));
                takePictureIntent.putExtra(Constants.IMAGE_FILE_NAME, currentFileName);
                activity.startActivityForResult(takePictureIntent, Constants.TAKE_PHOTO);
            }
        }
    }

    private File createImageFile() throws IOException {
        // set up storage dir
        File storageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
        if (!storageDir.exists()) {
            if (!storageDir.mkdirs()) {
                Log.e(TAG, "failed to create directory");
                return null;
            }
        }
        // set up file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String fileName = "img_" + timeStamp + "_";
        String suffix = ".jpg";

        File image = File.createTempFile(fileName, suffix, storageDir);
        currentFileName = image.getName();
        currentFile = image;
        return image;
    }

    private void addPictureToGallery() {
        Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
        contentUri = getUri(currentPhotoPath);
        mediaScanIntent.setData(contentUri);
        activity.sendBroadcast(mediaScanIntent);
    }

    private Uri getUri(String currentPhotoPath) {
        File f = new File(currentPhotoPath);
        return Uri.fromFile(f);
    }
}

我怎样才能完成这项任务？在此先感谢您的帮助！

这里是整个MyCamera课程：

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sudo iptables -A FORWARD -i bond0 -o docker0 -m state --state RELATED,ESTABLISHED -j ACCEPT
sudo iptables -A FORWARD -i docker0 -o bond0 -j ACCEPT

Answer 1

根据这篇文章：onActivityResult is not being called in Fragment

尝试添加您的托管活动

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
      super.onActivityResult(requestCode, resultCode, data);
 }

它允许将未处理的活动结果传递给您的片段。

另外，请务必致电fragment.startActivityForResult()而不是activity.startActivityForResult()。

Answer 2

我尝试使用Intent并从同一个片段调用onActivetyResult（）。但onActivityResult（）永远不会被调用。

这是因为您在startActivityForResult()上呼叫Activity，而不是在片段上。您的onActivityResult()方法会转到您调用startActivityForResult()的对象上。因此，如果您希望片段具有onActivityResult()，请在片段上调用startActivityForResult()。

在Android中使用相机应用程序后打开DialogFragment

2 个答案: